DTOs for index mostly done, doing DB models

SVSim.EmulatedEntrypoint/Models/Dtos/UserTutorial.cs

@@ -0,0 +1,16 @@
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// The state of a user's tutorial progress.
+/// </summary>
+[MessagePackObject]
+public class UserTutorial
+{
+    /// <summary>
+    /// The current tutorial step they are on.
+    /// </summary>
+    [Key("tutorial_step")]
+    public int TutorialStep { get; set; }
+}